linux-kernel - Re: [PATCH] ata: libahci_platform: Remove abundant check

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Date:   Thu, 23 Dec 2021 12:31:06 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>, <hdegoede@...hat.com>,
        <axboe@...nel.dk>, <p.zabel@...gutronix.de>
CC:     <linux-ide@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ata: libahci_platform: Remove abundant check

Hello!

On 22.12.2021 10:24, Jiasheng Jiang wrote:

> It can be found that platform_get_irq() returns nagative code but not
> null when fails.

    s/null/zero/?

> The comment of the platform_get_irq clearly shows that.

    This comment still doesn't correspond to reality -- 0 can be returned 
(although this would cause a WARN() call)...

> Therefore it should be better to remove the useless check.

    This patch is correct but premature. I have a (not yet merged) patch:

https://marc.info/?l=linux-kernel&m=163623041902285

    It actually disables reporting IRQ0. Until it's merged we have to filter 
out IRQ0 in the libata drivers as libata treats 0 as an indication of the 
polling mode...

> Fixes: fd990556f0fa ("ata: move library code from ahci_platform.c to libahci_platform.c")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
[...]

MBR, Sergey